Explosive material (7)
I believe the answer is:
cordite
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">explosive material</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that cordite is a explosive material)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cordite that I've seen before include "Smokeless explosive used in bullets" , "Type of explosive" , "Explosive propellant" .)